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Seq <br /> uoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 fJ Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(5 10)988 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 5ugro West, Inc Client Project ID Shell,,2575 Country Club Blvd , Stockton, CA <br /> 1050 Melody Lane, Ste 160 Matnx Soil <br /> Roseville, CA 95678 <br /> Attention Sudhakar Talanki QC Sample Group 5060421-422 Reported Jun 21, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyi- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst. C Lee C Lee C Lee C Lee <br /> Concentration <br /> Spiked. 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Batch# LCS061695 LCSG61695 LCS061695 LCS061695 <br /> Date Prepared: N/A NIA N/A N/A <br /> Date Analyzed 8/16/95 6/16/95 6/16/95 6/16/95 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> Recovery- 91 93 93 92 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch # BS061695 SS061695 SS061695 SS061695 <br /> Date Prepared. N/A N/A N/A N/A <br /> Date Analyzed 6/16/95 6/16/95 6/16/95 6/16/95 <br /> Instrument I D #- GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery 90 91 92 91 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 95 97 96 97 <br /> Relative % <br /> Difference 54 64 53 64 <br />�EOUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> ���Cl validation of sample batch results Due to matrix effects,the QC limits for MS/MSD s are advisory onlyLinda C Schneider and are not used to accept or reject batch results <br /> Project Manager <br /> 5060421 FUG <2> <br />